1.1 This specification covers the minimum technical requirements for the application of full thickness portland cement-based plaster for exterior (stucco) and interior work. These requirements do not by default define a unit of work or assign responsibility for contractual purposes, which is the purview of a contract or contracts made between contracting entities.
1.2 This specification sets forth tables for proportioning of various plaster mixes and plaster thickness. NOTE 1—General information will be found in Annex A1. Design considerations will be found in Annex A2.
1.3 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
1.4 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM C926-23 Referenced Document
ASTM C1063 Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
ASTM C11 Standard Terminology Relating to Gypsum and Related Building Materials and Systems
ASTM C1116/C1116M Standard Specification for Fiber-Reinforced Concrete*, 2023-08-01 Update
ASTM C1328 Standard Specification for Plastic (Stucco) Cement*, 2024-04-21 Update
ASTM C1787 Standard Specification for Installation of Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical Wall Applications*, 2023-08-02 Update
ASTM C206 Standard Specification for Finishing Hydrated Lime
ASTM C207 Standard Specification for Hydrated Lime for Masonry Purposes
ASTM C219 Standard Terminology Relating to Hydraulic and Other Inorganic Cements*, 2024-04-01 Update
ASTM C25 Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
ASTM C260/C260M Standard Specification for Air-Entraining Admixtures for Concrete*, 2024-04-21 Update
ASTM C35 Standard Specification for Inorganic Aggregates for Use in Gypsum Plaster
ASTM C578 Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
ASTM C595/C595M Standard Specification for Blended Hydraulic Cements*, 2023-07-15 Update
ASTM C631 Standard Specification for Bonding Compounds for Interior Gypsum Plastering
ASTM C897 Standard Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters
ASTM C91/C91M Standard Specification for Masonry Cement
ASTM C932 Standard Specification for Surface-Applied Bonding Agents for Exterior Plastering
ASTM E119 Standard Test Methods for Fire Tests of Building Construction and Materials
ASTM E492 Standard Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the Tapping Machine
ASTM E90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
ASTM C926-23 history
2023ASTM C926-23a Standard Specification for Application of Portland Cement-Based Plaster
2023ASTM C926-23 Standard Specification for Application of Portland Cement-Based Plaster
2022ASTM C926-22c Standard Specification for Application of Portland Cement-Based Plaster
2022ASTM C926-22b Standard Specification for Application of Portland Cement-Based Plaster
2022ASTM C926-22a Standard Specification for Application of Portland Cement-Based Plaster
2022ASTM C926-22 Standard Specification for Application of Portland Cement-Based Plaster
2021ASTM C926-21 Standard Specification for Application of Portland Cement-Based Plaster
2020ASTM C926-20b Standard Specification for Application of Portland Cement-Based Plaster
2020ASTM C926-20a Standard Specification for Application of Portland Cement-Based Plaster
2020ASTM C926-20 Standard Specification for Application of Portland Cement-Based Plaster
2019ASTM C926-19ae1 Standard Specification for Application of Portland Cement-Based Plaster
2019ASTM C926-19a Standard Specification for Application of Portland Cement-Based Plaster
2019ASTM C926-19 Standard Specification for Application of Portland Cement-Based Plaster
2018ASTM C926-18b Standard Specification for Application of Portland Cement-Based Plaster
2018ASTM C926-18a Standard Specification for Application of Portland Cement-Based Plaster
2018ASTM C926-18 Standard Specification for Application of Portland Cement-Based Plaster
2017ASTM C926-17 Standard Specification for Application of Portland Cement-Based Plaster
2016ASTM C926-16c Standard Specification for Application of Portland Cement-Based Plaster
2016ASTM C926-16b Standard Specification for Application of Portland Cement-Based Plaster
2016ASTM C926-16a Standard Specification for Application of Portland Cement-Based Plaster
2016ASTM C926-16 Standard Specification for Application of Portland Cement-Based Plaster
2015ASTM C926-15be1 Standard Specification for Application of Portland Cement-Based Plaster
2015ASTM C926-15b Standard Specification for Application of Portland Cement-Based Plaster
2015ASTM C926-15a Standard Specification for Application of Portland Cement-Based Plaster
2015ASTM C926-15 Standard Specification for Application of Portland Cement-Based Plaster
2014ASTM C926-14a Standard Specification for Application of Portland Cement-Based Plaster
2014ASTM C926-14 Standard Specification for Application of Portland Cement-Based Plaster
2013ASTM C926-13a Standard Specification for Application of Portland Cement-Based Plaster
2013ASTM C926-13 Standard Specification for Application of Portland Cement-Based Plaster
2012ASTM C926-12a Standard Specification for Application of Portland Cement-Based Plaster
2012ASTM C926-12 Standard Specification for Application of Portland Cement-Based Plaster
2011ASTM C926-11a Standard Specification for Application of Portland Cement-Based Plaster
2011ASTM C926-11 Standard Specification for Application of Portland Cement-Based Plaster
2006ASTM C926-06 Standard Specification for Application of Portland Cement-Based Plaster
1998ASTM C926-98a(2005) Standard Specification for Application of Portland Cement-Based Plaster
1998ASTM C926-98a Standard Specification for Application of Portland Cement-Based Plaster